Here is some information by the U.S. Environmental Protection Agency about safe drinking water in schools: http://www.epa.gov/ogwdw000/schools/guidance.html

Some might argue that the solution lies with "disposable" water bottles, readily available from vending machines and food service. For information about why this is a problem go to:http://www.treehugger.com/files/2007/07/reasons_to_ditch_bottled_water.php